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Long-Term Debt and Credit Facility, Carrying Amount Table (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Principal amount, carrying amount and interest expense of notes          
Principal amount $ 225.0   $ 225.0   $ 225.0
Carrying amount, net of discount 161.4   161.4   155.3
Convertible Notes
         
Principal amount, carrying amount and interest expense of notes          
Principal amount 175.0   175.0   175.0
Less: unamortized issuance discount (13.6)   (13.6)   (19.7)
Carrying amount, net of discount 161.4   161.4   155.3
Contractual coupon interest 2.0 2.0 5.9 5.9  
Amortization of discount 2.0 1.9 6.0 5.4  
Amortization of deferred financing costs 0.3 0.3 0.9 0.9  
Total interest expense $ 4.3 [1] $ 4.2 [1] $ 12.8 [1] $ 12.2 [1]  
[1] A portion of the interest relating to the Convertible Notes is capitalized as Construction in progress.